{"id":11982,"date":"2023-10-30T18:24:01","date_gmt":"2023-10-31T01:24:01","guid":{"rendered":"https:\/\/www.mysqltutorial.org\/?page_id=11982"},"modified":"2023-10-30T18:25:08","modified_gmt":"2023-10-31T01:25:08","slug":"mysql-json_array_append","status":"publish","type":"page","link":"https:\/\/www.mysqltutorial.org\/mysql-json\/mysql-json_array_append\/","title":{"rendered":"MySQL JSON_ARRAY_APPEND() Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the MySQL <code>JSON_ARRAY_APPEND()<\/code> function to add an element to a JSON array within a JSON document.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to the MySQL JSON_ARRAY_APPEND() function <\/h2>\n\n\n\n<p>The <code>JSON_ARRAY_APPEND()<\/code> function adds an element to a <a href=\"https:\/\/www.mysqltutorial.org\/mysql-json\/mysql-json_array\/\">JSON array<\/a> in a JSON document. <\/p>\n\n\n\n<p>Here&#8217;s the syntax of the <code>JSON_ARRAY_APPEND()<\/code> function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">JSON_ARRAY_APPEND(json_doc, path, value1, value2, ...)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this syntax:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>json_doc<\/code>: This is the JSON document that contains the array to which you want to append elements.<\/li>\n\n\n\n<li><code>path<\/code>: The path to the array within the JSON document.<\/li>\n\n\n\n<li><code>value1, value2, ...<\/code>: The values you want to append to the JSON array.<\/li>\n<\/ul>\n\n\n\n<p>This <code>JSON_ARRAY_APPEND()<\/code> function is useful when you want to update JSON data stored in tables.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">MySQL JSON_ARRAY_APPEND() function examples<\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>JSON_ARRAY_APPEND()<\/code> function.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1) Adding elements to a JSON array<\/h3>\n\n\n\n<p>The following example uses the <code>JSON_ARRAY_APPEND()<\/code> function to add elements to a JSON array:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> JSON_ARRAY_APPEND(<span class=\"hljs-string\">'&#91;\"red\",\"green\"]'<\/span>, <span class=\"hljs-string\">'$'<\/span>, <span class=\"hljs-string\">'blue'<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"plaintext\" data-shcb-language-slug=\"plaintext\"><span><code class=\"hljs language-plaintext\">+---------------------------------------------------+\r\n| JSON_ARRAY_APPEND('&#91;\"red\",\"green\"]', '$', 'blue') |\r\n+---------------------------------------------------+\r\n| &#91;\"red\", \"green\", \"blue\"]                          |\r\n+---------------------------------------------------+\r\n1 row in set (0.00 sec)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">plaintext<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">plaintext<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this example, we append the value &#8216;blue&#8217; to the JSON array <code>[\"red\", \"green\"]<\/code> that results in the <code>[\"red\", \"green\", \"blue\"]<\/code><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2) Adding elements to nested a JSON array<\/h3>\n\n\n\n<p>The following example uses the <code>JSON_ARRAY_APPEND()<\/code> function to add elements to nested JSON arrays:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> \n  JSON_ARRAY_APPEND(\n    <span class=\"hljs-string\">'{ \"colors\": &#91;\"red\", \"green\"], \"fonts\": &#91;\"serif\"] }'<\/span>, \n    <span class=\"hljs-string\">'$.colors'<\/span>, <span class=\"hljs-string\">'blue'<\/span>\n  );<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"plaintext\" data-shcb-language-slug=\"plaintext\"><span><code class=\"hljs language-plaintext\">+---------------------------------------------------------+\r\n| json_doc                                                |\r\n+---------------------------------------------------------+\r\n| {\"fonts\": &#91;\"serif\"], \"colors\": &#91;\"red\", \"green\", \"blue\"]}|\r\n+---------------------------------------------------------+\r\n1 row in set (0.00 sec)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">plaintext<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">plaintext<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this example, the JSON document has two arrays: colors and fonts. <\/p>\n\n\n\n<p>The <code>JSON_ARRAY_APPEND()<\/code> function appends the <code>'blue'<\/code> string to the colors array by using the path <code>'$.colors'<\/code>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3) Adding an element to a JSON array in a table<\/h3>\n\n\n\n<p>First, <a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-create-table\/\">create a new table<\/a> called <code>decorations<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> decorations(\n   <span class=\"hljs-keyword\">id<\/span> <span class=\"hljs-built_in\">INT<\/span> AUTO_INCREMENT PRIMARY <span class=\"hljs-keyword\">KEY<\/span>,\n   <span class=\"hljs-keyword\">data<\/span> <span class=\"hljs-keyword\">JSON<\/span>\n);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Next, insert a new JSON document into the <code>decorations<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span> decorations(<span class=\"hljs-keyword\">data<\/span>)\n<span class=\"hljs-keyword\">VALUES<\/span>(<span class=\"hljs-string\">'{ \"colors\": &#91;\"red\", \"green\"], \"fonts\": &#91;\"serif\"] }'<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Then, query data from the <code>decorations<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> * <span class=\"hljs-keyword\">FROM<\/span> decorations\n<span class=\"hljs-keyword\">WHERE<\/span> <span class=\"hljs-keyword\">id<\/span> = <span class=\"hljs-number\">1<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"plaintext\" data-shcb-language-slug=\"plaintext\"><span><code class=\"hljs language-plaintext\">+----+--------------------------------------------------+\r\n| id | data                                             |\r\n+----+--------------------------------------------------+\r\n|  1 | {\"fonts\": &#91;\"serif\"], \"colors\": &#91;\"red\", \"green\"]} |\r\n+----+--------------------------------------------------+\r\n1 row in set (0.01 sec)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">plaintext<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">plaintext<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>After that, add an element (<code>'georgia'<\/code>) to the fonts array using the <code>JSON_ARRAY_APPEND()<\/code> function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">UPDATE<\/span> decorations\n<span class=\"hljs-keyword\">SET<\/span> <span class=\"hljs-keyword\">data<\/span> = JSON_ARRAY_APPEND(<span class=\"hljs-keyword\">data<\/span>, <span class=\"hljs-string\">'$.fonts'<\/span>, <span class=\"hljs-string\">'georgia'<\/span>)\n<span class=\"hljs-keyword\">WHERE<\/span> <span class=\"hljs-keyword\">id<\/span> = <span class=\"hljs-number\">1<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Finally, query data from the <code>decorations<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-11\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> * <span class=\"hljs-keyword\">FROM<\/span> decorations\n<span class=\"hljs-keyword\">WHERE<\/span> <span class=\"hljs-keyword\">id<\/span> = <span class=\"hljs-number\">1<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-11\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-12\" data-shcb-language-name=\"plaintext\" data-shcb-language-slug=\"plaintext\"><span><code class=\"hljs language-plaintext\">+----+-------------------------------------------------------------+\r\n| id | data                                                        |\r\n+----+-------------------------------------------------------------+\r\n|  1 | {\"fonts\": &#91;\"serif\", \"georgia\"], \"colors\": &#91;\"red\", \"green\"]} |\r\n+----+-------------------------------------------------------------+\r\n1 row in set (0.00 sec)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">plaintext<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">plaintext<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the MySQL <code>JSON_ARRAY_APPEND()<\/code> function to append an element to a JSON array within a JSON document.<\/li>\n<\/ul>\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<header>\n\t\t<div class=\"wth-question\">Was this tutorial helpful? <\/div>\n\t\t<div 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